The Oslo police say they're setting up a special unit to investigate the twin attacks of July 22 and have collected phones, cameras, and computers from the island of Utoeya for the investigation.

Prosecutor Paal-Fredrik Hjort Kraby, who is in charge of the Oslo police investigation, said the structure of the new task force would be announced "in a few days."

Kraby said police had collected all of the electronic equipment found on the island of Utoeya, where far-right extremist Anders Behring Breivik has admitted to gunning down 69 participants in the Labor Party youth wing's retreat.

Breivik's two attacks left 77 people dead.

In addition to the 69 people, most of them teenagers, killed on Utoeya, eight people were killed in a bomb attack on Oslo's government quarter.